have 56 stock 235 has anyone hop up there 6 banger[/QUOTE
There isn't alot of aftermarket hop up items out there for them but the first thing you can do is mill the head. they were a very low compression engine. Then add a split manifold and a webber holley two barrel. Makes for a pretty good running old stovebolt. If you really want to fake em out. Look for a GMC 261 engine. They are built on the same casting and look the same but have the added displacement.